Redditor pete_w35 visited the site of a World War II POW camp in Greece. He had a particular mission.

My grandfather (still living at 91) was an Australian POW in WW2. He was captured in Greece and spent the war in Torun, Poland, a fortress town. I had an opportunity to travel there in 2013. My grandfather had been a bit of an "artful dodger" in the camp and made a set of keys that he used to break into storage-rooms in search of food and coal. When he was repatriated he hid the keys in a specific window frame. Before I left, he asked me to have a look for the keys.